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Commitments And Contingencies (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) property	Mar. 31, 2016 USD ($)
Trading Activity, Gains and Losses, Net [Line Items]
Lease expenses	$ 10.3	$ 9.4
Contracted future purchases	$ 461.3
Acquisition Of Fairmont, Minnesota and Wood River, Nebraska Ethanol Plants [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Number of ethanol plants | property	2
Previously accrued contingent liabilities that no longer represent probable losses	$ 6.3
Gain contingency	$ 5.5

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